Retrospective ratings of ADHD symptoms made at young adulthood by clinic-referred boys with ADHD-related problems, their brothers without ADHD, and control participants.

Retrospective childhood attention-deficit/hyperactivity disorder (ADHD) symptoms are required to diagnosis adult ADHD, but the validity of self-rated symptoms across time is questionable. Here, boys with ADHD-related problems, their brothers without ADHD, and former schoolmates rated themselves during young adulthood for ages 9, 14, and 19. Brothers rated probands retrospectively at the same ages. The young adults referred as children for ADHD (a) acknowledged childhood symptoms; (b) described improvement over time; (c) did not differ from brothers or controls on most self-ratings of young adult symptoms; (d) rated themselves as more symptomatic at age 9, but less symptomatic at age 19, than their brothers rated them; and (e) agreed only to some degree with brothers' ratings of probands' aggression (median correlation = .22). Probands' ratings showed limited agreement with judges' symptom ratings (median correlation = .16) and young adult follow-up examiners' ratings (median correlation = .14). These findings are not accounted for solely by changes in informants, nor by the course of ADHD psychopathology. They suggest some stability but limited internal consistency and validity for retrospective ADHD ratings by probands and brothers.